DESCRIPTION

SSL_want() returns state information for the SSL object ssl.

The other SSL_want_*() calls are shortcuts for the possible states returned
by SSL_want().

NOTES

SSL_want() examines the internal state information of the SSL object. Its
return values are similar to that of SSL_get_error(3).
Unlike SSL_get_error(3), which also evaluates the
error queue, the results are obtained by examining an internal state flag
only. The information must therefore only be used for normal operation under
non-blocking I/O. Error conditions are not handled and must be treated
using SSL_get_error(3).

The result returned by SSL_want() should always be consistent with
the result of SSL_get_error(3).

RETURN VALUES

The following return values can currently occur for SSL_want():

SSL_NOTHING

There is no data to be written or to be read.

SSL_WRITING

There are data in the SSL buffer that must be written to the underlying
BIO layer in order to complete the actual SSL_*() operation.
A call to SSL_get_error(3) should return
SSL_ERROR_WANT_WRITE.

SSL_READING

More data must be read from the underlying BIO layer in order to
complete the actual SSL_*() operation.
A call to SSL_get_error(3) should return
SSL_ERROR_WANT_READ.

SSL_X509_LOOKUP

The operation did not complete because an application callback set by
SSL_CTX_set_client_cert_cb() has asked to be called again.
A call to SSL_get_error(3) should return
SSL_ERROR_WANT_X509_LOOKUP.